Power feeding device for liquid or semiliquid material



1964 K. H. LlEDBERG ETAL 3, 18,

POWER FEEDING DEVICE FOR LIQUID OR SEMILIQUID MATERIAL Filed July 22,1960 2 Sheets-Sheeii 1 Fig.

/ Z 2 5% AJLS-ATTORNEY 1964 K. H. LIEDBERG ETAL 3,113,569

POWER FEEDING DEVICE FOR LIQUID 0R SEMILIQUID MATERIAL Filed July 22,1960 2 Sheets-Sheet 2 Fig. 2 l

rec Q73 75 I4 l3 'i Ills C; M ATTORNEY United States Patent 3,118,569PGWER FEEDWG DEVHIE FGR LEQUID GR SEMKLIQUID MATERHAL Kurt HermanLiedberg, Stig Folke Adrian Peterson, and

Karl Gosta Alierson, lrara, Sweden, amignors to Atlas Copco Aktiebolag,Nacka, Sweden, a corporation of Sweden Filed July 22, 1960, Ser. No.44,692 6 Claims. (Cl. 22274) This invention relates to power feedingdevices for liquid or semiliquid material such as paint, bitumen,plaster or the like. A considerable difliculty in connection withhandling of such materials consists in the necessity to use highpressure material containers from which the material is conveyed tospray guns or other coating appliances. One object of the presentinvention is to avoid the use of the heavy and awkward pressurizablecontainers for paint or other material. Another object of the inventionis to provide a container which does not need to be pressurized andwhich may be refilled without interrupting the operation of the spraygun or the like. A further object of the invention is to provide a powerfeeding device which is cheap in manufacture. A still further object ofthe invention is to provide a power feeding device in which thepressurized elements have small volumes so that damage caused by rupturewill be rather limited. A still further object of the invention is toprovide a device which is easy to clean and in which wear of the partsin cont act with the material is reduced. Other objects and advantagesof this invention will be apparent from the following description, theaccompanying drawings, and the appended claims.

Two embodiments of the invention are illustrated on the accompanyingdrawings in which FIG. 1 illustrates a device with automatic supply ofmaterial to the receptacle when the discharge is interrupted and FIG. 2shows a device in which material is supplied to the receptacle when thespraying appliance such as a spray gun is hung up on a suitable hook.

In the two figures of the drawings equivalent elements have beenindicated by the same reference numerals in order to avoid too longdescriptions. A paint container 1 of relatively thin and cheap sheetmaterial is provided with a cover 2 having an opening 3 through which apressurizable small receptacle 4 may be introduced and immersed in thematerial 5 such as paint. The receptacle 4 rests with short legs 6 onthe bottom 7 of the container 1, and has a bottom inlet opening 8controlled by a simple disc valve 9 carried at the lower end of a stem10. The receptacle 4 is further provided with compressed air inletopenings 11 at the top of the receptacle which communicate through atube 12 enclosing the stem with a passage 13 in a cylinder casing 14containing a piston 15 connected to the stem 19. A spring 16 is providedin the cylinder casing 14 and acts to move the piston 15 in openingdirection of the check valve 9. A membrane 17 divides the cylindercasing 14 in chambers 18 and 19 and the cylinder casing further containsa chamber 20 separated from the chamber 19 by a partition 21. A valvemember 22 controls an outlet opening 23 leading from the chamber 29 tothe atmosphere and said valve member is carried by a stem 24 secured tothe membrane 17 and extending through a passage 25 in the partition 21which in closed position of the valve member 22 permits air flow fromthe chamber 1'9 to the chamber 2%. The chamber 28 communicates through aconduit 26 with the passage 13- and the chamber 19 communicates througha hose 2-7 with a pressure reduction valve 28 communicating through ahose 2? with a control valve casing 30. 31 is a casing having a Venturipassage 32, and 33 is a paint 2 spray gun of conventional design havinga material discharge valve 34 controlled by means of a trigger 35.

Compressed air is supplied from a suitable source through a hose 36 tothe casing 31 and flows through the Venturi passage 32 through a hose 37to the spray gun 33.

The control valve casing 38 has a cover 38 and a mem brane 39 whichseparates two chambers 40 and 41 in the control valve casing. Thepressure portion of the chamber 49 is connected through a pipe 42 to thecasing 31 and the chamber 41 is connected through a pipe 43- over a flowrestriction device 44- and a pipe 45 to the Venturi passage 32. Thedevice 44 consists of a casing 46 accommodating a throttle member 47which is loaded by a soft spring 48 and which has a narrow passage 49through which compressed air may always flow in restricted quantitiesthrough the device 44-. The device 44 provides small resistance to airflow from pipe 43 to pipe 45, but considerable resistance to air flow inthe opposite direction. The membrane 39 is connected by a stem 50 to amember 51 provided in a space 52 in the valve casing 30 which in allpositions of the member 51 communicates through the pipe 29 with thechamber 19 and through a pipe 53 with the chamber 18 in the cylindercasing 14. Compressed air is supplied to the casing 30 through a pipe 54which communicates with a space 55- in the casing 30 which upon movementof the member 51 to the right in FIG. 1 against the action of a spring56 opens supply of compressed air to the chamber 18 and of comprmsed airof reduced pressure :to the chamber 19 thereby causing the piston 15 tomove down and close the valve 9 and the membrane 17 to move upwards andclose the opening 23 so that compressed air is supplied to thereceptacle 4 through the orifices 11. 57 is a vent passage in the casing39 through which compressed air is vented to the atmosphere whenspraying is interrupted, LC. when the air flow through the Venturipassage 32 is interrupted and full line pressure is applied on bothsides of the membrane 39.

:When the trigger 35 is pulled air pressure drops in the Venturi passage32 and the membrane 3% quickly moves to the right in FIG. 1 causing themember 51 to open the passage from pipe 54 to the pipes 27 and 53 sothat the membrane 17 moves to the illustrated position, the piston 15moves down and closes valve 9, and compressed air is supplied to theopenings 11 and the top of the receptacle 4-.

A conduit 58 leads from an outlet opening 59 near the bottom of thereceptacle 4 over a ball check valve 60 and a two-way-va'lve 61 to thepaint conduit =62 which is attached to the spray gtui 33. The paint isthen conveyed to a chamber 63 from which the paint is discharged uponretraction of the needle valve 34 by means of the trigger 35. 64- is areturn flow pipe which may be brought in communication with the painthose 62 when the two way-valve is turned to a position in which thepassage from the pipe 58 is closed.

.65 is a compressed air driven motor which is supplied with compressedair through a hose 66 and drives a shaft 67 mounted in a bracket 68extending from the receptacle 4 and carrying a stirring propeller 69.

,When operation of the paint gun is interrupted air pressure in 45 and42 is equalized and air supply over hoses 27 and 53 is interrupted bymember 5 1 which returns to the illustrated position and chamber 18 isthen vented through hose 53, space 52 and vent passage 57 so that spring'16 opens valve 9. When spraying has been finished the two-way-v-alve 61may be brought into the position in which 53 is closed and the hose 62communicates with the return flow pipe 64 and if the trigger 35 is thenpulled the air in the spray gun will force any paint in the hose 62 backto the container 1. This position of the valve 61 may also be used whenit is desired to flush the spray gun and conduit with cleaning liquid. 1

in the embodiment illustrated in PEG. 2 the control device 3% has beenreplaced by a valve device 7 t which may be of the same design as thevalve device 32 illustrated in FIG. 1 of K. H. Lied'bergs US. Patent2,819,928 granted January 14, 1958. The valve device 79 is connectedthrough the hose 71 to a compressed air source and through a hose '72 tothe chamber '13 of the cylinder casing 14. A hook 73 is movably mountedin the valve device 7t? on a suitable pivot 74 and may be arranged tooperate in the same way as the hook 37 in K. H. Liedergs above numberedU.S. Patent 2,819,928 so that when the spray gun 33 is hung up on thehook the air flow from the hose 71 to the hose 72 is interrupted and thehose 72 is instead vented to the atmosphere. In the embodiment of PEG.2. compressedair is supplied to the spray gun 33 through a separate hose75 and furthermore compressed air is supplied through a conduit 76 overa pressure reduction valve 77 and a pipe 78 to the chamber 19 of thecylinder casing 14. The device according to FIG. 2 operates in such amanner that when the spray gun is hun up on the :hook 73 the receptacle4 is vented and the valve 9 lifted so that paint may enter into theinterior of the receptacle 4 and when the spray gun is lifted from thehook '73 venting of the chamber 18 is interrupted and compressed air issupplied over the pressure reduction valve 77 through the chambers 19and 20 to the openings 11 and the top of the receptacle 4 so that paintin said recepn cle is subjected to pressure and forced to the spray gun.

The above describe material feeding devices should only be considered asexamples and may be modified in venous different ways within the scopeof the claims without departing from the principle of the invention.

What we claim is:

in a self-contained and pautially submersible fluid pressured activatedfeeding and dispensing apparatus for the pressure fluid pumping anddispensing of liquid and semi-liquid materials when said apparatus ispartially immersed in said material in a container therefor, thecombination which comprises a closed feeding receptacle for immersion insaid liquid material and disposed at one end of said apparatus, pressurefluid supply and control means remotely disposed at the other end ofsaid apparatus, said receptacle having a material inlet therein foradmitting said liquid material thereinto for pressure feeding therefromunder the action of a pressure fluid different from said material to befed, a remotely controlled valve for said material inlet, means forintroducing said pressure fluid into said receptacle, means including anoutlet conduit from said receptacle for the pressurized feeding of saidmaterial from said receptacle to a remote dispensing head under theaction of said pressure fluid in said receptacle, additional means forseparately supplying said pressure fluid directly to said dispensinghead during dispensing said material thereat, a control valve at saiddispensing head for controlling said pressure fluid supplied thereto,and means in said pressure fluid supply and control means responsive topressure of said pressure fluid at said dispensing head for controllingsaid inlet valve in said material receptacle and said supply of pressurefluid thereto.

CAD

2. A self-contained feeding and dispensing apparatus as recited in claim1 in which said means in said pressure fluid supply and control meansresponsive to pressure of said pressure fluid at said dispensing headincludes means for automatically actuating said valve for said materialinlet and said means for introducing said pressure fluid into saidreceptacle so as to admit pressure fluid into said receptacle for saidpressurized feeding of said material from said receptacle to saiddispensing head and to open said material inlet valve for refilling ofsaid receptacle after a feeding of said material from said receptacle tosaid dispensing head.

3. Self-contained feeding and dispensing apparatus as recited in claim 1which also includes a discharge device at said remote dispensing head,said discharge device and said dispensing head being movable withrespect to the remainder of said apparatus and with at least a portionof said outlet conduit means between said receptacle and said dischargedevice being flexible, support means for temporarily supporting saiddischarge device on said apparatus when not in use, automatic pressurevalve means responsive to the weight of said discharge device whensupported on said support means for actuating said control means toclose said inlet valve and admit pressure fluid into said receptaclewhen said discharge device is not on said support means and to open saidinlet valve and vent said receptacle when said discharge device issupported on said support means. i i

4. Self-contained feeding and dispensing apparatus as recited in claim 1in which said remotely disposed control means includes a fluid pressureactivated piston for closing said inet valve in said receptacle, meansvfor biasing said piston into open position in the absence of fluidpressure, a diaphragm valve responsive to fluid pressure thereon forselectively supplying fluid pressure into said receptacle and ventingfluid pressure therefrom, and actuat-ing means responsive to use of saidcontrol valve at said remote dispensing head for automatically actuatingsaid piston and said diaphragm valve.

5. Self-contained feeding and dispensing apparatus as recited in claim 4which also includes a discharge valve at said remote dispensing head andin which said actuating means is responsive to fluid pressure at saiddischarge valve.

6. Self-contained feeding and dispensing apparatus as recited in claim 4in which said operating means at said remote dispensing head includes adischarge valve control for discharge of said material and said pressurefluid, and in which said automatic actuating means is responsive tofluid pressure at said discharge valve for actuating said remotelydisposed control means to close said inlet valve and admit pressurefluid into said receptacle whenever said discharge valve is open and toopen said inlet valve and vent said receptacle whenever said dischargevalve is closed.

Grant Oct. 22, 1912 Hunter n day 15, 1956

1. IN A SELF-CONTAINED AND PARTIALLY SUBMERSIBLE FLUID PRESSUREDACTIVATED FEEDING AND DISPENSING APPARATUS FOR THE PRESSURE FLUIDPUMPING AND DISPENSING OF LIQUID AND SEMI-LIQUID MATERIALS WHEN SAIDAPPARATUS IS PARTIALLY IMMERSED IN SAID MATERIAL IN A CONTAINERTHEREFOR, THE COMBINATION WHICH COMPRISES A CLOSED FEEDING RECEPTACLEFOR IMMERSION IN SAID LIQUID MATERIAL AND DISPOSED AT ONE END OF SAIDAPPARATUS, PRESSURE FLUID SUPPLY AND CONTROL MEANS REMOTELY DISPOSED ATTHE OTHER END OF SAID APPARATUS, SAID RECEPTACLE HAVING A MATERIAL INLETTHEREIN FOR ADMITTING SAID LIQUID MATERIAL THEREINTO FOR PRESSUREFEEDING THEREFROM UNDER THE ACTION OF A PRESSURE FLUID DIFFERENT FROMSAID MATERIAL TO BE FED, A REMOTELY CONTROLLED VALVE FOR SAID MATERIALINLET, MEANS FOR INTRODUCING SAID PRESSURE FLUID INTO SAID RECEPTACLE,MEANS INCLUDING AN OUTLET CONDUIT FROM SAID RECEPTACLE FOR THEPRESSURIZED FEEDING OF SAID MATERIAL FROM SAID RECEPTACLE TO A REMOTEDISPENSING HEAD UNDER THE ACTION OF SAID PRESSURE FLUID IN SAIDRECEPTACLE, ADDITIONAL MEANS FOR SEPARATELY SUPPLYING SAID PRESSUREFLUID DIRECTLY TO SAID DISPENSING HEAD DURING DISPENSING SAID MATERIALTHEREAT, A CONTROL VALVE AT SAID DISPENSING HEAD FOR CONTROLLING SAIDPRESSURE FLUID SUPPLIED THERETO, AND MEANS IN SAID PRESSURE FLUID SUPPLYAND CONTROL MEANS RESPONSIVE TO PRESSURE OF SAID PRESSURE FLUID AT SAIDDISPENSING HEAD FOR CONTROLLING SAID INLET VALVE IN SAID MATERIALRECEPTACLE AND SAID SUPPLY OF PRESSURE FLUID THERETO.